What type of field do inductive loops create for detection?

Inductive loops are used primarily for vehicle detection in traffic signals by creating an electromagnetic field. When a vehicle enters the loop, it alters the inductance of the loop, which can be detected by the connected traffic signal control system. This mechanism relies on the principles of electromagnetism, where the presence of metallic objects, like vehicles, affects the electromagnetic properties of the loop system.

The electromagnetic field generated by the inductive loop is essential for its operation, as it allows for reliable detection of vehicles without the need for physical contact. This detection method is favored for its effectiveness and durability, making it a widely adopted technology in traffic signal systems. Understanding the principle behind inductive loops helps in grasping their application in intelligent transportation systems and their role in traffic management.